216112525 has 6 divisors (see below), whose sum is σ = 267979562. Its totient is φ = 172890000.

The previous prime is 216112513. The next prime is 216112543. The reversal of 216112525 is 525211612.

It can be written as a sum of positive squares in 3 ways, for example, as 65755881 + 150356644 = 8109^2 + 12262^2 .

It is not a de Polignac number, because 216112525 - 2⁷ = 216112397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 8644501 = 216112525 / (2 + 1 + 6 + 1 + 1 + 2 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216112525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4322226 + ... + 4322275.

Almost surely, 2^216112525 is an apocalyptic number.

216112525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216112525 is a deficient number, since it is larger than the sum of its proper divisors (51867037).

216112525 is an equidigital number, since it uses as much as digits as its factorization.

216112525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8644511 (or 8644506 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 216112525 is about 14700.7661364978. The cubic root of 216112525 is about 600.1041717275.

The spelling of 216112525 in words is "two hundred sixteen million, one hundred twelve thousand, five hundred twenty-five".